Did this in a smaller size only desktop size. Took 3 days fastest Ive ever done something like this. This was done as practice trying out a new technique. Ordinarily i work in color at all times and eye ball it. Takes me alot of time to put my disorder into perfection. This started with the grid method and in greyscale and then was colored. I borrowed a traditional art technique and put some gold leaf over my squares. Not perfect but one of the best things Ive done I think.
my own reference image